Respiratory System

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Across
  1. 2. the trachea splits into two branches called ...
  2. 4. these are a pair of organs where air passes in and out of.
  3. 6. the type of blood vessel found in the lung tissue
  4. 8. the gas we exhale, which is produced in respiration.
Down
  1. 1. this is the scientific name of the windpipe.
  2. 3. the gas we breathe in, which is used for respiration.
  3. 5. the bronchi split into smaller tubes called ...
  4. 6. the substances that forms the trachea, bronchi and bronchioles.
  5. 7. these are the air sacs in the lungs and is where gas exchange takes place.